JPH1131502A - Manufacture of pole plate, and nonaqueous electrolyte secondary battery - Google Patents

Manufacture of pole plate, and nonaqueous electrolyte secondary battery

Info

Publication number
JPH1131502A
JPH1131502A JP9183952A JP18395297A JPH1131502A JP H1131502 A JPH1131502 A JP H1131502A JP 9183952 A JP9183952 A JP 9183952A JP 18395297 A JP18395297 A JP 18395297A JP H1131502 A JPH1131502 A JP H1131502A
Authority
JP
Japan
Prior art keywords
paste
active material
electrode plate
undercoat
solvent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP9183952A
Other languages
Japanese (ja)
Other versions
JP4083260B2 (en
Inventor
Hiroshi Maruyama
浩 丸山
Yorito Oohana
頼人 大花
Tokuaki Samitsu
徳昭 佐見津
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP18395297A priority Critical patent/JP4083260B2/en
Publication of JPH1131502A publication Critical patent/JPH1131502A/en
Application granted granted Critical
Publication of JP4083260B2 publication Critical patent/JP4083260B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

PROBLEM TO BE SOLVED: To provide a pole plate manufacturing method that can improve a charging-discharging cycle characteristic by improving binding strength between current collector foil and an active material layer, while increasing the ratio of active material in the active material layer. SOLUTION: Primng paste 7 with a binding agent, a conductive material and a solvent mixed is applied to current collector foil 1 (2), and while the applied priming paste 7 is in a wet state with the solvent, an active material paste 8 (9) containing an active material powder, a binding agent and a solvent that can dissolve the solvent is applied onto the priming paste 7 in the wet state. The active material paste 8 (9) is then dried along with the priming paste 7.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、リチウム二次電池
等に用いられる電極板の製造方法および非水電解液二次
電池に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electrode plate used for a lithium secondary battery or the like and a non-aqueous electrolyte secondary battery.

【０００２】[0002]

【従来の技術】従来、この種の非水電解液二次電池の電
極板の製造方法は、図７に示すように、集電体金属箔２
１に、正極活物質又は負極活物質を結着剤等と共に溶媒
に混合して得た活物質ペーストを塗布し、乾燥させて活
物質層２３を形成している。2. Description of the Related Art Conventionally, a method of manufacturing an electrode plate for a non-aqueous electrolyte secondary battery of this kind is shown in FIG.
1, an active material paste obtained by mixing a positive electrode active material or a negative electrode active material with a binder and the like in a solvent is applied and dried to form an active material layer 23.

【０００３】電池を限られた容積の中でできるかぎり高
容量化するため、電極板中の活物質の比率を大きくした
いのであるが、そのため活物質層２３中の結着剤の体積
比率を減らすと、集電体金属箔２１と活物質層２３との
結着強度が低下する。この結着強度の低下を改善するた
め、例えば特開平１−２４１７６６号公報に開示されて
いるように（図８参照）、集電体金属箔２１に予め、導
電材と結着剤とを混合した下塗りペーストを薄く塗布
し、乾燥して下塗り層２２を得た後に、その下塗り層２
２の上に上記の活物質ペーストを塗布して、乾燥して活
物質層２３を形成するという方法が提案されている。In order to maximize the capacity of a battery within a limited volume, it is desired to increase the ratio of the active material in the electrode plate. Therefore, the volume ratio of the binder in the active material layer 23 is reduced. Then, the binding strength between the current collector metal foil 21 and the active material layer 23 decreases. In order to improve the decrease in the binding strength, a conductive material and a binder are mixed in advance in the current collector metal foil 21 as disclosed in, for example, JP-A-1-241766 (see FIG. 8). The obtained undercoat paste is applied thinly and dried to obtain an undercoat layer 22.
A method has been proposed in which the above-mentioned active material paste is applied on the substrate 2 and dried to form the active material layer 23.

【０００４】[0004]

【発明が解決しようとする課題】しかしながら、発明者
らが検討した結果、上記の下塗りペーストを用いた電極
板の製造方法でも、集電体金属箔２１と活物質層２３間
の結着強度の向上が十分でなく、特に下塗り層２２と活
物質層２３との間の結着強度が低いのが原因であること
が判明した。その結果、繰り返し充放電によって活物質
層２３が集電体金属箔２１から剥がれて、充放電サイク
ル特性が低下するという問題がある。However, as a result of investigations by the present inventors, the method of manufacturing an electrode plate using the above-mentioned undercoat paste also shows that the binding strength between the current collector metal foil 21 and the active material layer 23 is low. It was found that the improvement was not sufficient, particularly because the binding strength between the undercoat layer 22 and the active material layer 23 was low. As a result, there is a problem that the active material layer 23 is peeled off from the current collector metal foil 21 by repeated charge and discharge, and the charge and discharge cycle characteristics are deteriorated.

【０００５】本発明は、上記問題に鑑み、活物質層中の
活物質の比率を大きくしつつ、集電体箔と活物質層との
結着強度を向上させて、充放電サイクル特性を向上させ
ることができる電極板の製造方法およびこの電極板を用
いた非水電解液二次電池を提供することを目的とする。In view of the above problems, the present invention improves the charge / discharge cycle characteristics by improving the binding strength between the current collector foil and the active material layer while increasing the ratio of the active material in the active material layer. It is an object of the present invention to provide a method for manufacturing an electrode plate that can be used and a nonaqueous electrolyte secondary battery using the electrode plate.

【０００６】[0006]

【課題を解決するための手段】本発明の電極板の製造方
法は、上記目的を達成するため、結着剤、導電材および
溶媒を混合した下塗りペーストを集電体箔に塗布して、
塗布された下塗りペーストが前記溶媒で湿潤状態のうち
に、活物質粉末、結着剤および前記溶媒を溶解できる溶
媒を含む活物質ペーストを湿潤状態の前記下塗りペース
トの上に塗布した後、前記活物質ペーストを前記下塗り
ペーストと共に乾燥することを特徴とする。In order to achieve the above object, a method of manufacturing an electrode plate according to the present invention comprises applying an undercoat paste containing a binder, a conductive material and a solvent to a current collector foil,
After the applied undercoat paste is wet with the solvent, an active material paste containing an active material powder, a binder, and a solvent capable of dissolving the solvent is applied onto the wet undercoat paste, and then the active paste is applied. The material paste is dried together with the undercoat paste.

【０００７】本発明の電極板の製造方法によれば、活物
質ペーストを塗布した際、下塗りペーストが湿潤状態で
あり、かつ下塗りペースト中の溶媒が活物質ペースト中
の溶媒に溶解するので、両ペースト層間の境界近傍で各
ペースト層中の溶媒が互いに拡散して溶媒比率が傾斜的
に分布して、乾燥後の両層間の結着強度は強固となる。
また、下塗りペースト中の結着剤によって集電体箔と下
塗り層間の結着強度は強固になるし、下塗りペースト中
の導電材によって下塗り層を介した集電体箔と活物質層
間の導電性も阻害されない。従って、活物質層中の活物
質の比率を大きくしつつ、集電体箔と活物質層との結着
強度を向上させることができる。According to the electrode plate manufacturing method of the present invention, when the active material paste is applied, the undercoat paste is in a wet state, and the solvent in the undercoat paste is dissolved in the solvent in the active material paste. In the vicinity of the boundary between the paste layers, the solvent in each paste layer is diffused with each other, and the solvent ratio is distributed with a gradient, so that the bonding strength between the two layers after drying becomes strong.
In addition, the binding strength between the current collector foil and the undercoat layer is increased by the binder in the undercoat paste, and the conductivity between the current collector foil and the active material layer via the undercoat layer is increased by the conductive material in the undercoat paste. Is not inhibited. Therefore, the binding strength between the current collector foil and the active material layer can be improved while increasing the ratio of the active material in the active material layer.

【０００８】活物質ペーストを塗布する際の下塗りペー
スト中の溶媒量を１５ｖｏｌ％以上とすると、下塗りペ
ーストが湿潤状態を呈し好ましい。前記の溶媒量が１５
ｖｏｌ％に満たないと、下塗りペースト層と活物質ペー
スト層間の溶媒の拡散がほとんどないので、両層間の結
着強度が強固とならず好ましくない。When the amount of the solvent in the undercoat paste at the time of applying the active material paste is 15 vol% or more, the undercoat paste is preferably in a wet state. The solvent amount is 15
If the content is less than vol%, there is almost no diffusion of the solvent between the undercoat paste layer and the active material paste layer, so that the binding strength between the two layers is not strong, which is not preferable.

【０００９】長手方向に連続的に走行させられるテープ
状の集電体箔に、下塗りペーストを塗布し、走行方向下
流の適所で活物質ペーストを塗布するようにすると、活
物質ペーストを塗布する際の下塗りペーストの十分な湿
潤状態を容易にかつ生産性よく得ることができ好まし
い。When an undercoating paste is applied to a tape-shaped current collector foil that can be continuously run in the longitudinal direction, and the active material paste is applied at an appropriate position downstream in the running direction, it is difficult to apply the active material paste. It is preferable because a sufficient wet state of the undercoat paste can be easily obtained with high productivity.

【００１０】リチウム−遷移金属複酸化物を正極活物質
の主成分とする正極板と、黒鉛粉末を負極活物質の主成
分とする負極板と、リチウム塩を有機溶媒に溶解した非
水電解液とを備えた非水電解液二次電池において、下塗
りペーストの結着剤の主成分がスチレンブタジエン共重
合体ラテックスである請求項１、２又は３記載の電極板
の製造方法により製造された正極板および負極板を用い
ると、活物質層中の活物質の比率を大きくしつつ、集電
体箔と活物質層との結着強度を向上させることができ、
その結果、図５に示すように、充放電サイクル特性を向
上させることができる。A positive electrode plate containing lithium-transition metal complex oxide as a main component of a positive electrode active material, a negative electrode plate containing graphite powder as a main component of a negative electrode active material, and a non-aqueous electrolytic solution in which a lithium salt is dissolved in an organic solvent The positive electrode produced by the method for producing an electrode plate according to claim 1, wherein a main component of the binder of the undercoat paste is a styrene-butadiene copolymer latex in the nonaqueous electrolyte secondary battery comprising: By using the plate and the negative electrode plate, while increasing the ratio of the active material in the active material layer, it is possible to improve the binding strength between the current collector foil and the active material layer,
As a result, as shown in FIG. 5, the charge / discharge cycle characteristics can be improved.

【００１１】[0011]

【発明の実施の形態】本発明の実施形態を図面に基づい
て以下に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

【００１２】本発明の電極板の製造方法の一実施形態
を、図１〜図３に示す。One embodiment of a method for manufacturing an electrode plate according to the present invention is shown in FIGS.

【００１３】先ず、電極板の製造装置は、図１、図２に
示すように、テープ状の正極の集電体箔１若しくは負極
の集電体箔２を繰出す繰出し機１１と、走行している集
電体箔１（２）を弛まないように支持する４つの支持ロ
ーラ１３と、走行している集電体箔１（２）に下塗りペ
ースト７を塗布する下塗りコーター５と、下塗りコータ
ー５の走行方向の約５０ｍｍ下流に配され走行している
集電体箔１の下塗りペースト７の上に正極活物質ペース
ト８若しくは負極活物質ペースト９を塗布する活物質コ
ーター６と、活物質コーター６の走行方向下流に配され
集電体箔１（２）に塗布された下塗りペースト７および
各活物質ペースト８（９）を乾燥する乾燥機１０と、乾
燥した集電体箔１（２）を一定の速度で巻取る巻取り機
１２とを備えている。なお、説明の簡素化のため図１、
図２では片面にのみ塗布するように図示しているが、下
塗りコーター５および活物質コーター６は集電体箔１
（２）の両面に配され、それぞれ両面に同時に各ペース
ト７、８（９）を塗布できるように構成されている。First, as shown in FIGS. 1 and 2, the apparatus for manufacturing an electrode plate is provided with a feeder 11 for feeding a positive electrode current collector foil 1 or a negative electrode current collector foil 2 in the form of a tape. Support rollers 13 for supporting the current collector foil 1 (2) without loosening, an undercoat coater 5 for applying an undercoat paste 7 to the running current collector foil 1 (2), and an undercoat coater 5, an active material coater 6 for applying the positive electrode active material paste 8 or the negative electrode active material paste 9 on the undercoat paste 7 which is disposed about 50 mm downstream in the running direction of the current collector foil 1 and running; 6, a dryer 10 for drying the undercoat paste 7 and each active material paste 8 (9) applied to the current collector foil 1 (2) and a dried current collector foil 1 (2) And a winding machine 12 that winds at a constant speed. . Note that, for simplicity of explanation, FIG.
Although FIG. 2 shows that the coating is performed only on one side, the undercoat coater 5 and the active material coater 6 are provided on the current collector foil 1.
It is arranged on both sides of (2), and is configured so that each paste 7, 8 (9) can be applied to both sides simultaneously.

【００１４】下塗りペースト７は、下塗りペースト７の
結着剤の主成分であるスチレンブタジエン共重合体ラテ
ックス乾燥粉末６ｗｔ％と、導電材であるアセチレンブ
ラック８ｗｔ％と、カルボキシルメチルセルロース１ｗ
ｔ％水溶液８６ｗｔ％とを混合して得た。この下塗りペ
ースト７中の水分量は８９ｖｏｌ％である。カルボキシ
ルメチルセルロースは、この下塗りペースト７および後
記の活物質ペースト８、９において、主に各ペースト
７、８、９を組成均一に混合するのを助けるための界面
活性剤として働くものである。The undercoat paste 7 comprises 6% by weight of a dry powder of styrene-butadiene copolymer latex, which is a main component of the binder of the undercoat paste 7, 8% by weight of acetylene black as a conductive material, and 1% by weight of carboxymethyl cellulose.
It was obtained by mixing with 86% by weight of a t% aqueous solution. The water content in the undercoat paste 7 is 89 vol%. Carboxymethylcellulose mainly serves as a surfactant in the undercoat paste 7 and the active material pastes 8 and 9 described later to help the pastes 7, 8, and 9 to be uniformly mixed in composition.

【００１５】正極活物質ペースト８は、ＬｉＣｏＯ2 粉
末５０ｗｔ％と、活物質ペースト８の結着剤の主成分で
あるフッ素樹脂系結着剤３．５ｗｔ％と、導電材である
アセチレンブラック１．５ｗｔ％と、カルボキシルメチ
ルセルロース１ｗｔ％水溶液４５ｗｔ％とを混合して得
た。負極活物質ペースト９は、コークスを加熱乾留し粉
砕して得た炭素粉末５０ｗｔ％と、活物質ペースト９の
結着剤の主成分であるフッ素樹脂系結着剤５ｗｔ％と、
カルボキシルメチルセルロース１ｗｔ％水溶液４５ｗｔ
％とを混合して得た。The positive electrode active material paste 8 comprises 50 wt% of LiCoO 2 powder, 3.5 wt% of a fluororesin-based binder which is a main component of the binder of the active material paste 8, and acetylene black which is a conductive material. It was obtained by mixing 5 wt% and 45 wt% of a 1 wt% aqueous solution of carboxymethyl cellulose. The negative electrode active material paste 9 includes 50 wt% of carbon powder obtained by heating dry distillation of coke and pulverization, and 5 wt% of a fluororesin-based binder which is a main component of the binder of the active material paste 9.
Carboxymethyl cellulose 1wt% aqueous solution 45wt
%.

【００１６】正極板は、前記製造装置にて、厚み２０μ
ｍのアルミ箔製の集電体箔１を速度５００ｍｍ／分で走
行させ、集電体箔１に下塗りコーター５にて下塗りペー
スト７を１〜２μｍ厚塗布した後、活物質コーター６に
て、湿潤状態の前記下塗りペースト７の上に活物質ペー
スト８を１８０μｍ厚塗布し、乾燥機１０にて活物質ペ
ースト８を下塗りペースト７と共に乾燥して得た。下塗
りコーター５と活物質コーター６間において、薄く塗布
された下塗りペースト７は混合当初の水分量８９ｖｏｌ
％から３０ｖｏｌ％程度へと自然に減少したが、十分な
湿潤状態を呈していた。[0016] The positive electrode plate has a thickness of 20 µm by the above manufacturing apparatus.
m of the current collector foil 1 made of aluminum foil at a speed of 500 mm / min, and applying an undercoating paste 7 to the current collector foil 1 with a thickness of 1 to 2 μm using the undercoat coater 5. The active material paste 8 was applied to a thickness of 180 μm on the wet undercoat paste 7, and the active material paste 8 was dried together with the undercoat paste 7 by a dryer 10. Between the undercoating coater 5 and the active material coater 6, the undercoating paste 7 applied thinly has a water content of 89 vol.
% To about 30% by volume, but showed a sufficient wet state.

【００１７】負極板は、前記製造装置にて、厚み１４μ
ｍの銅箔製の集電体箔２を速度５００ｍｍ／分で走行さ
せ、集電体箔２に下塗りペースト７を１〜２μｍ厚塗布
した後、活物質コーター６にて、湿潤状態の前記下塗り
ペースト７の上に活物質ペースト９を１５０μｍ厚塗布
し、乾燥機１０にて活物質ペースト９を下塗りペースト
７と共に乾燥して得た。下塗りペースト７は、その水分
量は３０ｖｏｌ％程度へと自然に減少したが、十分な湿
潤状態を呈していた。The negative electrode plate is 14 μm thick by the above manufacturing apparatus.
m of the current collector foil 2 made of copper foil at a speed of 500 mm / min., and applying the undercoat paste 7 to the current collector foil 2 to a thickness of 1 to 2 μm. An active material paste 9 was applied on the paste 7 to a thickness of 150 μm, and the active material paste 9 was dried together with the undercoat paste 7 by a dryer 10 to obtain the paste. The water content of the undercoat paste 7 was naturally reduced to about 30 vol%, but was sufficiently wet.

【００１８】このようにして得られた正極板あるいは負
極板は、その断面を図３に拡大して示すように、集電体
箔１（２）の両面に、薄い下塗り層３が形成され、各下
塗り層３の上に厚い活物質層４が形成されている。この
正極板および負極板の実施例１の各塗布層の結着強度
を、連続荷重式引掻強度試験機（ＪＩＳ Ｋ６７１８）
を用いた引掻強度で評価した。この試験機の概略を図４
に示すが、支点１８に枢支されたアーム１５の先端下方
に設けられた引掻刃１７が、そのアーム１５上に載った
ウエイト１６による荷重で試料１９の塗布面に押圧され
ており、この状態で試料１９を載せた試料台１４を水平
に移動させて、剥離の有無を判定するもので、印加する
荷重を段階的に増加させ、塗布層の剥離が発生したとき
の最低荷重がその試料１９の引掻強度となる。試験条件
は、引掻刃１７の引掻幅が５ｍｍで、試料台１４の移動
速度が６００ｍｍ／分であり、ウエイト１６の荷重の上
限を、正極板で２００ｇｆ、負極板で５００ｇｆとし
た。In the positive electrode plate or the negative electrode plate thus obtained, a thin undercoat layer 3 is formed on both surfaces of the current collector foil 1 (2) as shown in an enlarged cross section in FIG. A thick active material layer 4 is formed on each undercoat layer 3. The binding strength of each coating layer of the positive electrode plate and the negative electrode plate of Example 1 was measured using a continuous load type scratch strength tester (JIS K6718).
It was evaluated by the scratch strength using Fig. 4 shows the outline of this testing machine.
As shown in FIG. 5, a scratch blade 17 provided below a tip of an arm 15 pivotally supported by a fulcrum 18 is pressed against a coating surface of a sample 19 by a load by a weight 16 placed on the arm 15. In this state, the sample table 14 on which the sample 19 is placed is moved horizontally to determine the presence or absence of peeling. The applied load is increased stepwise, and the minimum load when peeling of the coating layer occurs is determined by the sample. A scratch strength of 19 is obtained. The test conditions were as follows: the scratch width of the scratch blade 17 was 5 mm, the moving speed of the sample stage 14 was 600 mm / min, and the upper limit of the load of the weight 16 was 200 gf for the positive electrode plate and 500 gf for the negative electrode plate.

【００１９】結果を比較例と共に表１にまとめたが、本
実施例の正極板および負極板は、集電体箔１（２）と下
塗り層３間の結着強度も、下塗り層３と活物質層４間の
結着強度も優れていることが判る。The results are summarized in Table 1 together with Comparative Examples. The positive electrode plate and the negative electrode plate of the present example showed that the binding strength between the current collector foil 1 (2) and the undercoat layer 3 was lower than that of the undercoat layer 3. It can be seen that the binding strength between the material layers 4 is also excellent.

【００２０】[0020]

【表１】 [Table 1]

【００２１】表１中、比較例１は、集電体箔１（２）に
下塗りペースト７を１〜２μｍ厚塗布した後、自然乾燥
にてその水分量が５〜１０ｖｏｌ％になるまで乾燥さ
せ、次いでその下塗りペースト７層の上に正（負）活物
質ペースト８（９）を、厚さ１８０μｍ（１５０μｍ）
塗布して、乾燥機１０にて乾燥させて得たものである。In Table 1, Comparative Example 1 shows that the undercoat paste 7 was applied to the current collector foil 1 (2) in a thickness of 1 to 2 μm and then dried by natural drying until the water content became 5 to 10 vol%. Then, a positive (negative) active material paste 8 (9) is coated on the undercoating paste 7 layer with a thickness of 180 μm (150 μm).
It is obtained by applying and drying with a dryer 10.

【００２２】また、比較例２は、下塗りペースト７を用
いず、集電体箔１（２）に直接正（負）活物質ペースト
８（９）を、厚さ１８０μｍ（１５０μｍ）塗布して、
乾燥機１０にて乾燥させて得たものである。この比較例
１のように、下塗りペースト７を用いて集電体箔１
（２）と活物質層４間に下塗り層３を形成しても、活物
質ペースト８（９）を塗布する際に下塗りペースト７が
ほとんど乾燥していると、十分な結着強度が得られない
ことが判る。In Comparative Example 2, a positive (negative) active material paste 8 (9) was applied directly to the current collector foil 1 (2) without using the undercoat paste 7 to a thickness of 180 μm (150 μm).
It is obtained by drying in a dryer 10. As in Comparative Example 1, the current collector foil 1 was
Even if the undercoat layer 3 is formed between (2) and the active material layer 4, if the undercoat paste 7 is almost dry when the active material paste 8 (9) is applied, sufficient binding strength can be obtained. It turns out that there is no.

【００２３】集電体箔１（２）に塗布された下塗りペー
スト７の自然乾燥の程度は、この下塗りペースト７が雰
囲気に曝される時間やその雰囲気の温度、湿度等に依存
して変化するが、活物質ペースト８（９）を塗布する際
の下塗りペースト７の水分量が１５ｖｏｌ％以上であれ
ば、正極板および負極板において、十分な結着強度が得
られることが判った。The degree of natural drying of the undercoat paste 7 applied to the current collector foil 1 (2) varies depending on the time during which the undercoat paste 7 is exposed to the atmosphere, the temperature and humidity of the atmosphere, and the like. However, it was found that if the water content of the undercoat paste 7 at the time of applying the active material paste 8 (9) was 15 vol% or more, sufficient binding strength was obtained in the positive electrode plate and the negative electrode plate.

【００２４】本発明の非水電解液二次電池の一実施形態
は、前記本発明の電極板の製造方法による正極板および
負極板を用い、リチウム塩を有機溶媒に溶解した非水電
解液とを備えたリチウム二次電池である。具体的な実施
例は、前記実施例の正極板および負極板を用い、非水電
解液としてＬｉＰＦ6 を炭酸エチレンと炭酸プロピレン
に溶解したものを用いて組み立てられたリチウム二次電
池である。このリチウム二次電池の充放電サイクル特性
を評価した結果を図５に実施例Ａで示す。図５は、充放
電を繰り返したときの充放電サイクル数を横軸に、当初
の放電容量を１００％とした放電容量を縦軸にしてプロ
ットした結果を比較例Ｂ、Ｃのものと共に示している。
比較例Ｂ、Ｃは、それぞれ前記の比較例１、２による正
極板および負極板を用いたリチウム二次電池である。One embodiment of the non-aqueous electrolyte secondary battery of the present invention uses a positive electrode plate and a negative electrode plate produced by the above-mentioned method for producing an electrode plate of the present invention, and comprises a non-aqueous electrolyte obtained by dissolving a lithium salt in an organic solvent. A lithium secondary battery provided with: A specific example is a lithium secondary battery assembled using the positive electrode plate and the negative electrode plate of the above example and using LiPF 6 dissolved in ethylene carbonate and propylene carbonate as a non-aqueous electrolyte. The result of evaluating the charge / discharge cycle characteristics of this lithium secondary battery is shown in FIG. FIG. 5 shows the results of plotting the number of charge / discharge cycles when the charge / discharge cycle is repeated on the horizontal axis and the discharge capacity with the initial discharge capacity being 100% on the vertical axis, along with those of Comparative Examples B and C. I have.
Comparative Examples B and C are lithium secondary batteries using the positive and negative electrode plates according to Comparative Examples 1 and 2, respectively.

【００２５】上記実施形態では、下塗りペースト７を塗
布する下塗りコーター５と、下塗りペースト７の上に活
物質ペースト８（９）を塗布する活物質コーター６とを
別々にして、下塗りペースト７をある程度自然乾燥させ
るようにしたが、本発明はこれに限定されず、図６に示
すように、下塗りコーターと活物質コーターとを一体に
構成したコーター１４を用い、下塗りペースト７を塗布
後、直ちに活物質ペースト８（９）を塗布するようにし
てもよい。また、コーター５、６に代えてスプレー等他
の既知の塗布手段を用いてもよい。In the embodiment described above, the undercoat coater 5 for applying the undercoat paste 7 and the active material coater 6 for applying the active material paste 8 (9) on the undercoat paste 7 are separately provided so that the undercoat paste 7 Although the present invention was air-dried, the present invention is not limited to this. As shown in FIG. 6, a coater 14 in which an undercoat coater and an active material coater are integrally formed is used. The material paste 8 (9) may be applied. Further, instead of the coaters 5 and 6, other known application means such as a spray may be used.

【００２６】上記実施形態では、集電体箔１（２）を金
属箔としたが、これに限定されず、導電製樹脂フィルム
でもよい。また各ペースト７、８、９の溶媒を水とした
が、これに限定されず、塩化メチレンやシクロヘキサン
等の有機溶媒でもよい。In the above embodiment, the current collector foil 1 (2) is a metal foil, but is not limited to this, and may be a conductive resin film. In addition, although the solvent of each of the pastes 7, 8, and 9 is water, the solvent is not limited to water, and may be an organic solvent such as methylene chloride or cyclohexane.

【００２７】また上記実施形態では、リチウム二次電池
について述べたが、これに限定されず、集電体箔に活物
質層を塗着させる電極板の製造方法に適用できる。In the above embodiment, a lithium secondary battery has been described. However, the present invention is not limited to this, and can be applied to a method of manufacturing an electrode plate in which an active material layer is applied to a current collector foil.

【００２８】[0028]

【発明の効果】本発明の電極板の製造方法によれば、活
物質ペーストを塗布した際、下塗りペーストが湿潤状態
であり、かつ下塗りペースト中の溶媒が活物質ペースト
中の溶媒に溶解するので、両ペースト層間の境界近傍で
各ペースト層中の溶媒が互いに拡散して溶媒比率が傾斜
的に分布して、乾燥後の両層間の結着強度は強固とな
る。また、下塗りペースト中の結着剤によって集電体箔
と下塗り層間の結着強度は強固になる。従って、活物質
層中の活物質の比率を大きくしつつ、集電体箔と活物質
層との結着強度を向上させることができる。According to the method for manufacturing an electrode plate of the present invention, when the active material paste is applied, the undercoat paste is in a wet state, and the solvent in the undercoat paste is dissolved in the solvent in the active material paste. In the vicinity of the boundary between the two paste layers, the solvent in each paste layer is diffused with each other, and the solvent ratio is inclinedly distributed, so that the bonding strength between the two layers after drying becomes strong. Further, the binding strength between the current collector foil and the undercoat layer is increased by the binder in the undercoat paste. Therefore, the binding strength between the current collector foil and the active material layer can be improved while increasing the ratio of the active material in the active material layer.

【００２９】活物質ペーストを塗布する際の下塗りペー
スト中の溶媒量を１５ｖｏｌ％以上とすると、下塗りペ
ーストが湿潤状態を呈し好ましい。When the amount of the solvent in the undercoat paste at the time of applying the active material paste is 15 vol% or more, the undercoat paste exhibits a wet state, which is preferable.

【００３０】長手方向に連続的に走行させられるテープ
状の集電体箔に、下塗りペーストを塗布し、走行方向下
流の適所で活物質ペーストを塗布するようにすると、活
物質ペーストを塗布する際の下塗りペーストの十分な湿
潤状態を容易にかつ生産性よく得ることができ好まし
い。When the undercoating paste is applied to a tape-shaped current collector foil that is continuously run in the longitudinal direction, and the active material paste is applied at an appropriate position downstream in the running direction, the active material paste is applied. It is preferable because a sufficient wet state of the undercoat paste can be easily obtained with high productivity.

【００３１】リチウム−遷移金属複酸化物を正極活物質
の主成分とする正極板と、黒鉛粉末を負極活物質の主成
分とする負極板と、リチウム塩を有機溶媒に溶解した非
水電解液とを備えた非水電解液二次電池において、下塗
りペーストの結着剤の主成分がスチレンブタジエン共重
合体ラテックスである前記の電極板の製造方法により製
造された正極板および負極板を用いると、活物質層中の
活物質の比率を大きくしつつ、集電体箔と活物質層との
結着強度を向上させることができ、その結果、充放電サ
イクル特性を向上させることができる。A positive electrode plate containing lithium-transition metal complex oxide as a main component of a positive electrode active material, a negative electrode plate containing graphite powder as a main component of a negative electrode active material, and a non-aqueous electrolytic solution in which a lithium salt is dissolved in an organic solvent In a non-aqueous electrolyte secondary battery comprising: using a positive electrode plate and a negative electrode plate manufactured by the method for manufacturing an electrode plate, wherein the main component of the binder of the undercoat paste is styrene butadiene copolymer latex In addition, while increasing the ratio of the active material in the active material layer, the binding strength between the current collector foil and the active material layer can be improved, and as a result, the charge / discharge cycle characteristics can be improved.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の電極板の製造方法の一実施形態を示す
概略図。FIG. 1 is a schematic view showing one embodiment of a method for manufacturing an electrode plate of the present invention.

【図２】前記電極板の製造方法を説明する概略図。FIG. 2 is a schematic view illustrating a method for manufacturing the electrode plate.

【図３】前記電極板の製造方法による電極板の一部を拡
大して示す断面図。FIG. 3 is an enlarged sectional view showing a part of the electrode plate according to the method of manufacturing the electrode plate.

【図４】前記電極板の製造方法による電極板の塗布層の
結着強度の評価方法を示す概略図。FIG. 4 is a schematic view showing a method for evaluating the binding strength of a coating layer of an electrode plate according to the method for manufacturing an electrode plate.

【図５】前記電極板の製造方法による正極板および負極
板を用いた非水電解液二次電池の一実施例の充放電サイ
クル特性を示す図。FIG. 5 is a diagram showing charge / discharge cycle characteristics of one embodiment of a nonaqueous electrolyte secondary battery using a positive electrode plate and a negative electrode plate according to the method for producing an electrode plate.

【図６】本発明の電極板の製造方法の別の実施形態を説
明する概略図。FIG. 6 is a schematic diagram illustrating another embodiment of the method for manufacturing an electrode plate according to the present invention.

【図７】従来例を示す断面図。FIG. 7 is a sectional view showing a conventional example.

【図８】検討例を示す断面図。FIG. 8 is a sectional view showing a study example.

【符号の説明】[Explanation of symbols]

１、２ 集電体箔 ７ 下塗りペースト ８、９ 活物質ペースト 1, 2 current collector foil 7 undercoat paste 8, 9 active material paste

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 結着剤、導電材および溶媒を混合した下
塗りペーストを集電体箔に塗布して、塗布された下塗り
ペーストが前記溶媒で湿潤状態のうちに、活物質粉末、
結着剤および前記溶媒を溶解できる溶媒を含む活物質ペ
ーストを湿潤状態の前記下塗りペーストの上に塗布した
後、前記活物質ペーストを前記下塗りペーストと共に乾
燥することを特徴とする電極板の製造方法。1. An undercoat paste in which a binder, a conductive material and a solvent are mixed is applied to a current collector foil, and the applied undercoat paste is wet with the solvent while the active material powder,
A method for producing an electrode plate, comprising: applying an active material paste containing a binder and a solvent capable of dissolving the solvent on the undercoat paste in a wet state, and then drying the active material paste together with the undercoat paste. . 【請求項２】 活物質ペーストを塗布する際の下塗りペ
ースト中の溶媒量が１５ｖｏｌ％以上である請求項１記
載の電極板の製造方法。2. The method for producing an electrode plate according to claim 1, wherein the amount of the solvent in the undercoat paste when applying the active material paste is 15 vol% or more. 【請求項３】 長手方向に連続的に走行するテープ状の
集電体箔に、下塗りペーストを塗布し、走行方向下流の
適所で活物質ペーストを塗布する請求項１又は２記載の
電極板の製造方法。3. The electrode plate according to claim 1, wherein an undercoating paste is applied to a tape-shaped current collector foil running continuously in the longitudinal direction, and the active material paste is applied at an appropriate position downstream in the running direction. Production method. 【請求項４】 リチウム−遷移金属複酸化物を正極活物
質の主成分とする正極板と、黒鉛粉末を負極活物質の主
成分とする負極板と、リチウム塩を有機溶媒に溶解した
非水電解液とを備えた非水電解液二次電池において、 下塗りペーストの結着剤の主成分がスチレンブタジエン
共重合体ラテックスである請求項１、２又は３記載の電
極板の製造方法により製造された正極板および負極板を
用いた非水電解液二次電池。4. A positive electrode plate containing lithium-transition metal complex oxide as a main component of a positive electrode active material, a negative electrode plate containing graphite powder as a main component of a negative electrode active material, and a non-aqueous solution prepared by dissolving a lithium salt in an organic solvent. A non-aqueous electrolyte secondary battery comprising an electrolyte solution, wherein the main component of the binder of the undercoat paste is a styrene-butadiene copolymer latex, which is manufactured by the method for manufacturing an electrode plate according to claim 1, 2, or 3. Non-aqueous electrolyte secondary battery using a positive electrode plate and a negative electrode plate.
JP18395297A 1997-07-09 1997-07-09 Method for producing electrode plate of non-aqueous electrolyte secondary battery Expired - Fee Related JP4083260B2 (en)

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